JP2020157424A - Dust collection system - Google Patents

Abstract

To improve control of a dust collection motor of a dust collection system provided with a power tool and a dust collector.SOLUTION: A dust collection system 1 includes: a hammer drill 2 which performs processing work to a workpiece by driving a tip tool 91; and a dust collector 7 which collects powder dust generated during the processing work. The hammer drill 2 includes a drive motor 31, and a drive mechanism 35 which drives the tip tool 91 by power of the drive motor 31. The dust collector 7 includes a dust collection motor 711, and a fan 713 which is driven to rotate by the dust collection motor 711 and generates an air flow for dust collection. The dust collection system 1 includes a controller 8 which controls a rotation speed of the dust collection motor 711 in response to a driving state of the hammer drill 2.SELECTED DRAWING: Figure 1

Description

The present invention relates to a dust collection system including a power tool and a dust collector.

A dust collection system including a power tool that performs machining work on a work material by driving a tip tool and a dust collector that is attached to the power tool and collects dust generated in the machining work is known. There is. In such a dust collection system, a motor for driving the tip tool (also called a drive motor) is provided in the power tool, while a motor for driving the dust collection fan (also called a dust collection motor) is provided. It may be provided in a dust collector (see, for example, Patent Document 1).

JP-A-2018-58188

In the dust collection system as described above, various control optimizations have been made for the drive motor of the power tool, but there is still room for improvement in the control of the dust collection motor.

An object of the present invention is to provide an improvement regarding control of a dust collection motor in a dust collection system including a power tool and a dust collector.

According to one aspect of the present invention, a power tool configured to perform machining work on a work piece by driving a tip tool and dust collector configured to collect dust generated in the machining work. A dust collection system with a device is provided.

The power tool includes a first motor and a drive mechanism configured to drive the tip tool by the power of the first motor. The dust collector includes a second motor and a fan that is rotationally driven by the second motor and is configured to generate an air flow for dust collection. Further, the dust collecting system includes a first control device configured to control the rotation speed of the second motor according to the driving state of the power tool. The first control device may be provided in the power tool or the dust collector.

The drive state of the power tool means, for example, the drive state of the first motor or the drive mechanism (whether or not it is driven, the rotation speed, etc.) and the motion state of the power tool (vibration state, rotation state, etc.). If the driving state of the power tool changes, the dust generation state can also change. In the dust collecting system of this embodiment, the first control device changes the dust collecting force of the dust collecting device by controlling the rotation speed of the second motor for dust collecting according to the driving state of the power tool, and dust is collected. It is possible to appropriately deal with situations where it is difficult to occur and situations where it is likely to occur.

In one aspect of the present invention, the first control device may be configured to change the rotation speed of the second motor according to the rotation speed of the first motor. According to this aspect, it is possible to change the dust collecting force of the dust collecting device according to the change of the rotation speed of the first motor which can change the dust generation state. In this embodiment, it is preferable that the first control device is configured to increase the rotation speed of the second motor as the rotation speed of the first motor increases. In the mode of "increasing the rotation speed of the second motor as the rotation speed of the first motor increases", for example, the second motor proportionally (linearly) as the rotation speed of the first motor increases. A mode of increasing the rotation speed of the motor, a mode of increasing the rotation speed quadratic (non-linearly), a mode of gradually increasing the speed, and a mode of increasing the threshold as a boundary. In this case, when the rotation speed of the first motor is relatively low, the power consumption of the second motor can be suppressed, and when the rotation speed of the first motor is relatively high, the dust collecting power of the dust collector can be increased.

In one aspect of the present invention, the first control device may be configured to change the rotation speed of the second motor according to the driving time from the start of driving the first motor. According to this aspect, it is possible to change the dust collecting force of the dust collector according to a change in the driving time that can change the dust generation state. In this embodiment, it is preferable that the first control device is configured to increase the rotation speed of the second motor as the driving time of the first motor becomes longer. The mode of "increasing the rotation speed of the second motor as the drive time becomes longer" is, for example, a mode of increasing the rotation speed of the second motor proportionally (linearly) as the drive time increases. It includes a mode of quadratically (non-linearly) raising, a mode of stepwise raising, and a mode of raising with a threshold as a boundary. In this case, when the drive time is relatively short, the power consumption of the second motor can be suppressed, and when the drive time is relatively long, the dust collecting power of the dust collector can be increased.

In one aspect of the present invention, the first control device drives the second motor at the first rotation speed until the drive time from the start of drive of the first motor reaches a predetermined time, and when the drive time reaches the predetermined time. , The rotation speed of the second motor may be changed to a second rotation speed lower than the first rotation speed. According to this aspect, it is possible to effectively collect the dust generated at the start of the processing work.

In one aspect of the present invention, the first control device determines the rotation speed of the second motor when the standby time corresponding to the drive time from the start of the drive of the first motor elapses after the drive of the first motor is stopped. It may be configured to change to zero (ie, stop driving). Even if the drive of the first motor is stopped and the machining work is completed, the dust generated during the machining work may not be completely collected. In addition, the amount of residual dust can change depending on the driving time. According to this aspect, it is possible to effectively collect such dust by providing a standby time according to the driving time of the first motor. In this embodiment, it is preferable that the longer the drive time of the first motor is, the longer the standby time is provided. The mode in which "the longer the driving time is, the longer the waiting time is provided" is, for example, a mode in which the second waiting time increases proportionally (linearly) as the driving time increases, quadratically. It includes a mode of increasing (non-linearly), a mode of increasing gradually, and a mode of increasing with a threshold as a boundary. In this case, when the drive time of the first motor is relatively short and the possibility that dust remains is lower, the power consumption of the second motor is suppressed, and the drive time of the first motor is relatively long, and more. When there is a possibility that dust remains, the dust collecting power of the dust collector can be increased.

In one aspect of the present invention, the power tool may further include a load detecting device that detects the load applied to the tip tool. Then, the first control device may be configured to change the rotation speed of the second motor according to the load. According to this aspect, it is possible to change the dust collecting force of the dust collector according to the change of the load on the tip tool which can change the dust generation state. In this embodiment, it is preferable that the first control device is configured to increase the rotation speed of the second motor as the load increases. The mode of "increasing the rotation speed of the second motor as the load increases" is, for example, a mode in which the rotation speed of the second motor is proportionally (linearly) increased in response to an increase in the load, secondary. It includes a mode of raising functionally (non-linearly), a mode of raising gradually, and a mode of raising with a threshold value as a boundary. In this case, when the load is relatively small, the power consumption of the second motor can be suppressed, and when the load is relatively large, the dust collecting power can be increased.

In one aspect of the present invention, the load detecting device may be configured to detect at least the vibration of the power tool as a load. Then, the first control device may be configured to change the rotation speed of the second motor according to the vibration. According to this aspect, it is possible to change the dust collecting force of the dust collector in response to a change in vibration that can change the dust generation state. In this embodiment, it is preferable that the first control device is configured to increase the rotation speed of the second motor as the vibration increases. The mode of "increasing the rotation speed of the second motor as the vibration increases" is, for example, a mode in which the rotation speed of the second motor is proportionally (linearly) increased in accordance with the increase in vibration, secondary. It includes a mode of raising functionally (non-linearly), a mode of raising gradually, and a mode of raising with a threshold value as a boundary. In this case, when the vibration is relatively small, the power consumption of the second motor can be suppressed, and when the vibration is relatively large, the dust collecting force can be increased.

In one aspect of the present invention, the dust collection system drives the first motor at a rotation speed that does not exceed a predetermined upper limit rotation speed when the load is equal to or less than a predetermined threshold value, and sets the upper limit rotation speed when the load exceeds the threshold value. A second control device configured to be able to drive the first motor at a rotation speed exceeding the speed may be further provided. Then, the first control device may be configured to change the rotation speed of the second motor in conjunction with the control of the first motor by the second control device. According to this aspect, the load detected by the load detecting device is also used for controlling the rotation speed of the first motor, which is effective in suppressing the power consumption of the first motor. Further, since the rotation speed of the second motor is also changed in conjunction with the rotation speed of the first motor, it is possible to appropriately change the dust collecting force of the dust collector. The second control device may be provided separately from the first control device, or may be shared by the first control device.

It is sectional drawing of the dust collection system. It is a block diagram which shows the electrical structure of a dust collection system. It is a figure which shows an example of the correspondence relationship between the rotation speed of a drive motor and the rotation speed of a dust collection motor schematically. It is a figure which shows an example of the correspondence relationship between the drive time of a drive motor and the rotation speed of a dust collector motor schematically. It is a figure which shows an example of the correspondence relationship between the drive time of a drive motor and the rotation speed of a dust collector motor schematically. It is a figure which shows an example of the correspondence relationship between the drive time of a drive motor and the standby time after a stop of a drive motor. It is a figure which shows typically an example of the correspondence relationship between acceleration and rotation speed of a dust collector motor. It is a figure which shows typically the drive start and stop timing of a drive motor and a dust collection motor.

Hereinafter, the dust collecting system 1 according to the embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the dust collecting system 1 of the present embodiment includes a hammer drill 2 and a dust collecting device 7. The hammer drill 2 is configured to perform machining work (chipping work and drilling work) by driving a detachably mounted tip tool 91 by the power of a drive motor 31. More specifically, the hammer drill 2 is configured to be capable of performing a hammer operation that drives the tip tool 91 linearly along the drive shaft A1 and a drill operation that rotationally drives the tip tool 91 around the drive shaft A1. There is. The hammering operation is used for chipping work, and the drilling operation is used for drilling work. Further, the dust collector 7 is detachably attached to the hammer drill 2 and is configured to collect dust generated in the processing work.

First, a schematic configuration of the hammer drill 2 will be described with reference to FIG.

As shown in FIG. 1, the outer shell of the hammer drill 2 is mainly formed by the main body housing 21 and the handle 25. The main body housing 21 includes a drive mechanism accommodating portion 22 accommodating the drive mechanism 35, a motor accommodating portion 23 accommodating the drive motor 31, and a controller accommodating portion 24, and is formed in a substantially Z-shape in side view as a whole. ing.

The drive mechanism accommodating portion 22 is formed as a long box-shaped body, and extends along the drive shaft A1. A tool holder 39 to which the tip tool 91 can be attached and detached is arranged in one end of the drive mechanism accommodating portion 22 in the drive shaft A1 direction. The motor accommodating portion 23 is formed as a long box-shaped body, and projects from the other end portion of the drive mechanism accommodating portion 22 in the drive shaft A1 direction in a direction away from the drive shaft A1. The drive motor 31 is arranged in the motor accommodating portion 23 so that the rotation axis of the motor shaft 311 extends in a direction intersecting the drive shaft A1 (specifically, in an oblique direction with respect to the drive shaft A1). ..

In the following description, for convenience, the axial direction of the drive shaft A1 (also referred to as the drive shaft A1 direction) is defined as the front-rear direction of the hammer drill 2, and one end side on which the tool holder 39 is provided is the front side of the hammer drill 2. The opposite side is defined as the rear side. Further, the direction orthogonal to the drive shaft A1 and corresponding to the axial direction of the rotation shaft of the motor shaft 311 is defined as the vertical direction of the hammer drill 2, and the direction in which the motor accommodating portion 23 protrudes is the downward direction and the opposite direction. Is defined as upward. Further, the directions orthogonal to the front-back direction and the up-down direction are defined as the left-right direction.

The controller housing portion 24 is a rectangular box-shaped portion of the main body housing 21 extending rearward from a substantially central portion (area in which the main body portion of the drive motor 31 is housed) in the vertical direction of the motor housing portion 23. .. The controller 5 is housed in the controller housing unit 24. Further, in the present embodiment, two battery mounting portions 245 to which the battery 93 can be attached and detached are provided side by side in the front-rear direction at the lower end portion (the lower portion of the controller 5) of the controller housing portion 24. In the present embodiment, the hammer drill 2 and the dust collector 7 are operated by the electric power supplied from the battery 93.

The handle 25 is formed in a substantially C shape in a side view as a whole, and both ends thereof are connected to the rear end portion of the main body housing 21. The handle 25 has a grip portion 26 that is gripped by the user. The grip portion 26 is arranged at a distance behind the main body housing 21 and extends substantially in the vertical direction so as to intersect the drive shaft A1. A trigger 261 capable of a pressing operation (pulling operation) by the user is provided on the front portion of the upper end portion of the grip portion 26.

The details of the physical configuration of the hammer drill 2 will be described below.

First, the main body housing 21 and its internal structure will be described.

As shown in FIG. 1, the drive mechanism 35 is housed in the drive mechanism accommodating portion 22. The drive mechanism 35 is configured to drive the tip tool 91 by the power of the drive motor 31. In the present embodiment, the drive mechanism 35 includes a motion conversion mechanism, a striking mechanism, and a rotation transmission mechanism. The motion conversion mechanism is a mechanism that converts the rotational motion of the motor shaft 311 into a linear motion and transmits it to the striking element. In this embodiment, a motion conversion mechanism using a swing member is adopted. The striking mechanism is a mechanism that linearly drives the tip tool 91 along the drive shaft A1 by striking the tip tool 91 by operating linearly. In the present embodiment, the striker and the impact bolt are combined. Including. The rotation transmission mechanism is a mechanism for rotationally driving the tip tool 91 by decelerating the rotational movement of the motor shaft 311 and then transmitting the rotational movement to the tool holder 39, and includes a plurality of gears. The operation mode of the hammer drill 2 (hammer drill mode, drill mode, hammer mode) is set in the motion conversion mechanism or the rotation transmission mechanism by the mode switching mechanism (not shown) according to the operation of the mode switching dial (not shown) by the user. It is switched by appropriately interrupting the transmission of power. Since the configurations of the drive mechanism 35 and the mode switching mechanism are well known, detailed description thereof will be omitted.

As described above, the motor accommodating portion 23 is connected to the rear end portion of the drive mechanism accommodating portion 22 and extends downward. The drive motor 31 is housed in the upper portion of the motor housing part 23. In this embodiment, a DC brushless motor is used as the drive motor 31. The drive motor 31 includes a motor main body including a stator and a rotor, and a motor shaft 311 extending from the rotor and rotating integrally with the rotor. The rotation shaft of the motor shaft 311 extends diagonally downward and forward with respect to the drive shaft A1.

A speed change dial unit 231 is housed in the rear part of the upper end of the motor housing part 23. Although detailed illustration is omitted, the speed change dial unit 231 includes a dial that can be rotated by the user from the outside of the motor accommodating portion 23, and a variable resistor mounted on a circuit board. The dial is an operating member for the user to set the rotation speed of the drive motor 31. The variable resistor outputs a resistance value according to the rotation position of the dial. The speed change dial unit 231 is connected to the controller 5 by a wiring (not shown), and outputs a signal indicating a resistance value (that is, a set rotation speed) corresponding to the rotation operation of the dial to the controller 5.

Further, the acceleration sensor unit 61 is supported at the rear portion of the lower portion of the motor accommodating portion 23 (that is, the region below the drive motor 31). Although detailed illustration is omitted, the acceleration sensor unit 61 includes a case, a substrate housed in the case, a control circuit 610 mounted on the substrate, and an acceleration sensor 611 (see FIG. 2). The acceleration sensor 611 detects acceleration as a physical quantity indicating vibration of the main body housing 21. The control circuit 610 determines whether or not the vibration (acceleration) detected by the acceleration sensor 611 exceeds a predetermined threshold value, and transmits a signal (hereinafter, referred to as an acceleration signal) according to the determination result via wiring (not shown). It is configured to output to the controller 5.

Further, a recess for fixing the dust collector 7 is provided at the front end portion of the lower portion of the motor accommodating portion 23. A connector 59 configured to be electrically connectable to the connector 715 of the dust collector 7 is provided in this recess.

The controller 5 is housed in the controller housing unit 24. Although detailed illustration is omitted, the controller 5 includes a case, a substrate housed in the case, a control circuit 50 and the like mounted on the substrate (see FIG. 2). Although details will be described later, in the present embodiment, the controller 5 controls the drive of the drive motor 31 based on the rotation speed set by the speed change dial unit 231, the operating state of the trigger 261 and the vibration of the main body housing 21. It is configured as follows.

Next, the handle 25 and its internal structure will be described.

As shown in FIG. 1, the handle 25 includes a grip portion 26, an upper connecting portion 28, and a lower connecting portion 29. As described above, the grip portion 26 is arranged so as to extend in the vertical direction, and a trigger 261 is provided at the front portion of the upper end portion. The grip portion 26 is formed in a long tubular shape, and a switch 263 is housed inside the grip portion 26. The switch 263 is always kept in the off state, and is turned on in response to the pulling operation of the trigger 261. That is, the switch 263 is configured to be able to detect the operation of the trigger 261 and the release of the operation. Further, the switch 263 is connected to the controller 5 (specifically, the control circuit 50) by a wiring (not shown), and when it is in the ON state, a signal corresponding to the operation amount of the trigger 261 (hereinafter, a trigger) is sent to the controller 5. (Called a signal) is output. The upper connecting portion 28 is a portion that extends forward from the upper end portion of the grip portion 26 and is connected to the upper rear end portion of the main body housing 21. The lower connecting portion 29 is a portion that extends forward from the lower end portion of the grip portion 26 and is connected to the central rear end portion of the main body housing 21. Further, the lower connecting portion 29 is arranged above the controller accommodating portion 24.

In the present embodiment, the handle 25 is elastically connected to the main body housing 21 so as to be relatively movable. More specifically, an elastic member 281 is interposed between the front end portion of the upper connecting portion 28 and the rear end portion of the drive mechanism accommodating portion 22. On the other hand, the lower connecting portion 29 is rotatably supported with respect to the motor accommodating portion 23 via a support shaft 291 extending in the left-right direction. With such a configuration, vibration transmission from the main body housing 21 to the handle 25 (grip portion 26) is suppressed.

Next, the dust collector 7 will be described. Since the dust collector 7 is used in a state of being mounted on the hammer drill 2, in the following description, for convenience, the direction of the dust collector 7 is set to the direction of the dust collector 7 when mounted on the hammer drill 2. It is also specified.

First, a schematic configuration of the dust collector 7 will be described. As shown in FIG. 1, the dust collector 7 includes a main body housing 70, a dust case 73, a sliding portion 75, and a dust transfer path 77. The main body housing 70 is configured to be removable from the main body housing 21 of the hammer drill 2. The main body housing 70 houses a dust collection motor 711 and a fan 713 that is rotationally driven by the dust collection motor 711 and is configured to form an air flow for dust collection. The dust case 73 is a container for accommodating dust, and is detachably attached to the main body housing 70. The sliding portion 75 is slidably held in the front-rear direction by the main body housing 70. Further, the sliding portion 75 has a suction port 754 for sucking dust, and includes a cover portion 753 capable of covering the tip of the tip tool 91. The dust transfer path 77 is a passage through which dust sucked from the suction port 754 is transferred, passes through the sliding portion 75, and is connected to the dust case 73.

When the dust collection motor 711 is driven and the fan 713 rotates, the dust generated by the processing work is sucked together with the air from the suction port 754 and flows into the dust case 73 through the dust transfer path 77. In the dust case 73, only dust is separated from the air by the filter 735 and contained. The air after the dust is separated is discharged from an exhaust port (not shown) provided in the main body housing 70. In this way, in the dust collecting system 1, the dust generated by the processing work by the hammer drill 2 is collected by the dust collecting device 7.

Hereinafter, the detailed configuration of the dust collector 7 will be described.

As shown in FIG. 1, the main body housing 70 is formed as a hollow body having a substantially Z-shaped side view, and includes a sliding guide portion 701, a connector portion 703, and a motor accommodating portion 705.

The sliding guide portion 701 is a rectangular box-shaped portion and constitutes an upper end portion of the main body housing 70. The sliding guide portion 701 has an internal space extending in the front-rear direction. The front end of the sliding guide portion 701 is provided with an opening for communicating the internal space to the outside. Although detailed description and illustration are omitted because it is a well-known configuration, a configuration for holding the sliding portion 75 slidably in the front-rear direction is provided inside the sliding guide portion 701.

The connector portion 703 is provided below the rear end portion of the sliding guide portion 701 and extends in the vertical direction. The rear wall portion of the connector portion 703 is provided with a convex portion that projects rearward. A connector 715 that can be electrically connected to the connector 59 of the hammer drill 2 is provided on the convex portion.

The motor accommodating portion 705 is a rectangular box-shaped portion provided below the connector portion 703 and extending rearward from the connector portion 703, and constitutes a lower end portion of the main body housing 70. Although detailed description and illustration are omitted because of the well-known configuration, a pair of guide rails extending in the front-rear direction are provided at the left and right upper ends of the motor accommodating portion 705. Further, a pair of guide grooves extending in the front-rear direction are provided at the lower ends of the left and right side surfaces of the motor accommodating portion 23 of the hammer drill 2. The dust collector 7 is attached to the main body housing 21 of the hammer drill 2 via a slide engagement between the guide rail and the guide groove. When the dust collector 7 is attached to the main body housing 21, the convex portion of the connector portion 703 fits into the concave portion of the motor accommodating portion 23, and the connector 715 is electrically connected to the connector 59.

A dust collecting motor 711, a fan 713, and a controller 8 are housed in the motor accommodating portion 705. More specifically, the dust collecting motor 711 is arranged so that the motor shaft extends in the front-rear direction. In this embodiment, a motor having a brush is adopted as the dust collecting motor 711. The fan 713 is fixed to the motor shaft on the front side of the main body (stator and rotor) of the dust collecting motor 711, and rotates integrally with the motor shaft. The fan 713 is a centrifugal fan. The front wall portion of the motor accommodating portion 705 is provided with an opening so as to face the suction region of the fan 713. Although detailed illustration is omitted, the controller 5 includes a case, a substrate housed in the case, a control circuit 80 mounted on the substrate, and the like (see FIG. 2). When the dust collector 7 is attached to the main body housing 21 as described above, the controller 8 is connected to the controller 5 of the hammer drill 2 via the connectors 715 and 59. Although details will be described later, in the present embodiment, the controller 8 is configured to control the driving of the dust collecting motor 711 based on the operating state of the trigger 261 and the driving state of the hammer drill 2.

As shown in FIG. 1, the dust case 73 is a rectangular box-shaped container, and has an inflow port into which an air flow containing dust flows in and an outflow port in which an air flow after the dust is separated flows out. .. The outflow port communicates with an opening provided on the front side of the fan 713 of the motor accommodating portion 705. A filter 735 is arranged inside the dust case 73. The air flow that has passed through the filter 735 flows into the motor accommodating portion 705 from the dust case 73 through the outflow port, and is discharged to the outside of the dust collector 7 from the exhaust port (not shown).

As shown in FIG. 1, the sliding portion 75 is a tubular member having a substantially L-shaped side view as a whole, and has a first tubular portion 751 extending linearly in the front-rear direction and a first cylinder. Includes a second tubular portion 752 extending upward from the front end of the shaped portion 751. The cover portion 753 is provided at the upper end portion of the second tubular portion 752, and is configured to be able to cover the tip of the tip tool 91. The suction port 754 penetrates the cover portion 753 in the front-rear direction. As for the sliding portion 75, a part of the first tubular portion 751 is always arranged in the sliding guide portion 701, and the second tubular portion 752 including the cover portion 753 protrudes forward from the sliding guide portion 701. In this state, it is held in the main body housing 70.

As shown in FIG. 1, the dust transfer path 77 is a passage extending in the sliding portion 75 and connecting the suction port 754 and the inflow port of the dust case 73. The dust sucked from the suction port 754 is transferred to the dust case 73 through the dust transfer path 77. In the present embodiment, the dust transfer path 77 is defined by a part of the sliding portion 75 (second tubular portion 752), the hose 771, and the hose connecting portion 775. The hose 771 is formed in a bellows shape and is expandable and contractible. One end of the hose 771 is connected to the lower end of the second tubular portion 752. The other end of the hose 771 projects rearward from the rear end of the sliding portion 75 and is connected to one end of the hose connecting portion 775. The other end of the hose connection portion 775 is arranged in the dust case 73 via the inflow port. With such a configuration, a dust transfer path 77 connecting the suction port 754 and the dust case 73 is formed.

Further, in the present embodiment, the hose 771 is equipped with a spring 772. In this embodiment, a compression coil spring is adopted as the spring 772. The sliding portion 75 is constantly urged in a direction protruding from the main body housing 70, that is, forward by the elastic force of the spring 772. Therefore, in a state where an external force toward the rear does not act on the sliding portion 75 (hereinafter, also referred to as an initial state), the sliding portion 75 is held in the initial position (position shown in FIG. 1). When a machining operation (for example, a drilling operation) is performed while the tip of the tip tool 91 and the cover portion 753 are pressed against the work material, the spring 772 slides against the urging force as the machining work progresses. The moving portion 75 is pushed into the main body housing 70. Then, when the processing work is completed and the pressing is released, the sliding portion 75 returns to the initial position by the elastic force of the spring 772.

Hereinafter, the electrical configuration of the hammer drill 2 and the dust collector 7 will be described with reference to FIG.

The hammer drill 2 includes a control circuit 50 mounted on the substrate of the controller 5, a drive circuit 51, and a current detection amplifier 55. Further, the hall sensor 53, the switch 263, the speed change dial unit 231 and the acceleration sensor unit 61 (control circuit 610), and the connector 59 are electrically connected to the control circuit 50.

In the present embodiment, the control circuit 50 is composed of a microcomputer including a CPU, ROM, RAM, timer, and the like. The drive circuit 51 includes a three-phase bridge circuit using six semiconductor switching elements. The current detection amplifier 55 converts the current flowing through the drive motor 31 into a voltage by a shunt resistor, and further outputs a signal amplified by the amplifier to the control circuit 50. The Hall sensor 53 includes three Hall elements arranged corresponding to each phase of the drive motor 31, and outputs a signal indicating the rotation position of the rotor to the control circuit 50. As described above, the switch 263 outputs a trigger signal corresponding to the operation amount of the trigger 261 to the control circuit 50 in response to the pull operation of the trigger 261. The speed change dial unit 231 outputs a signal corresponding to the set rotation speed to the control circuit 50 via the rotation operation of the dial. The control circuit 610 of the acceleration sensor unit 61 outputs an acceleration signal corresponding to the vibration (acceleration) detected by the acceleration sensor 611 to the control circuit 50.

The control circuit 50 starts or stops driving the drive motor 31 based on various signals input from the hall sensor 53, the current detection amplifier 55, the switch 263, the speed change dial unit 231 and the acceleration sensor unit 61 and the like. Further, the rotation speed of the drive motor 31 is appropriately set, the drive duty ratio of each switching element is set according to the rotation speed, and the control signal corresponding to this is output to the drive circuit 51. In this way, the control circuit 50 controls the drive of the drive motor 31.

The dust collector 7 includes a control circuit 80 and a drive circuit 81 mounted on the substrate of the controller 8. A connector 715 is electrically connected to the control circuit 80. In the present embodiment, the control circuit 80 is composed of a microcomputer including a CPU, a ROM, a RAM, a timer, and the like, like the control circuit 50. The drive circuit 81 includes a switching element.

As described above, when the dust collector 7 is attached to the main body housing 21, the control circuit 80 is electrically connected to the control circuit 50 of the hammer drill 2 via the connectors 715 and 59. When connected to the control circuit 80, the control circuit 50 outputs at least a trigger signal from the switch 263 to the control circuit 80. The control circuit 80 starts or stops driving the dust collection motor 711 by switching the on / off state of the switching element of the drive circuit 81. Further, the rotation speed of the dust collecting motor 711 is appropriately set, and a current corresponding to the rotation speed is passed through the switching element. In this way, the control circuit 80 controls the drive of the dust collection motor 711.

The operation control in the dust collecting system 1 will be described. In the present embodiment, the drive of the drive motor 31 of the hammer drill 2 is controlled by the control circuit 50 of the hammer drill 2, while the drive of the dust collection motor 711 of the dust collector 7 is controlled by the control circuit 80 of the dust collector 7. Controlled separately by.

First, the control of the drive motor 31 by the control circuit 50 (more specifically, the CPU) of the hammer drill 2 will be described.

In the present embodiment, the control circuit 50 is configured to perform so-called soft no-load control (also referred to as low-speed rotation control at no load) with respect to the drive motor 31. The soft no-load control means that when the switch 263 is in the ON state, the rotation speed of the drive motor 31 is set to a predetermined relatively low rotation speed (hereinafter,, in the no-load state when the tip tool 91 is not loaded). This is a drive control method that allows the rotation speed of the drive motor 31 to exceed the initial rotation speed while limiting to the following (referred to as the initial rotation speed). According to the soft no-load control, wasteful power consumption of the drive motor 31 in the no-load state can be reduced. In the present embodiment, the no-load state and the load state are discriminated according to whether or not the vibration (acceleration) detected by the acceleration sensor 611 is equal to or less than a predetermined threshold value. The control circuit 50 controls the rotation speed of the drive motor 31 based on whether the acceleration signal output from the control circuit 610 of the acceleration sensor unit 61 is a signal corresponding to a no-load state or a signal indicating a load state. ..

In the present embodiment, the rotation speed set by the speed change dial unit 231 is used as the rotation speed (that is, the maximum rotation speed) corresponding to the maximum operation amount of the trigger 261. Then, the rotation speed of the drive motor 31 is set based on the maximum rotation speed and the actual operation amount (operation ratio) of the trigger 261.

Specifically, after the switch 263 is turned on, the control circuit 50 monitors the acceleration signal from the acceleration sensor 611, and while the hammer drill 2 is in the no-load state, the maximum rotation speed and the operation of the trigger 261 are performed. If the rotation speed calculated based on the amount is equal to or less than the initial rotation speed, the drive motor 31 is driven at the calculated rotation speed. On the other hand, when the calculated rotation speed exceeds the initial rotation speed, the control circuit 50 drives the drive motor 31 at the initial rotation speed. Further, when the hammer drill 2 shifts from the no-load state to the load state, the control circuit 50 drives the drive motor 31 at a rotation speed calculated based on the maximum rotation speed and the operation amount of the trigger 261. The control circuit 50 stops driving the drive motor 31 when the pulling operation of the trigger 261 is released and the switch 263 is turned off.

Next, the control of the dust collection motor 711 by the control circuit 80 (more specifically, the CPU) of the dust collector 7 will be described.

In the present embodiment, the control circuit 80 is configured to control the rotation speed of the dust collecting motor 711 according to the driving state of the hammer drill 2. The drive state of the hammer drill 2 includes, for example, the drive state of the drive motor 31 and the drive mechanism 35 (whether or not there is drive, the rotation speed, etc.), and the motion state (vibration state, rotation state, etc.) of the hammer drill 2 (specifically, the main body housing 21). Etc.). If the driving state of the hammer drill 2 changes, the dust generation state may also change. Therefore, the control circuit 80 changes the dust collecting force of the dust collecting device 7 by controlling the rotation speed of the dust collecting motor 711 according to the driving state of the hammer drill 2, and the dust collecting force is unlikely to be generated. It becomes possible to respond appropriately to the situation.

An example of the driving state of the hammer drill 2 that can be adopted in the present embodiment and control of the rotation speed of the dust collecting motor 711 according to the driving state will be described below.

As a first example, an example in which the rotation speed of the drive motor 31 is adopted as the drive state of the hammer drill 2 will be described. In this example, the control circuit 80 is configured to change the rotation speed of the dust collecting motor 711 according to the rotation speed of the drive motor 31. Specifically, the control circuit 50 of the hammer drill 2 transmits a signal indicating the rotation speed of the drive motor 31 (hereinafter referred to as a speed signal) via the connectors 59 and 715 while the switch 263 is on. Output to the control circuit 80 of 7. The speed signal may indicate the rotation speed set by the control circuit 50, or may indicate the actual rotation speed of the drive motor 31 specified by the output signal from the hall sensor 53. Good. The control circuit 50 sets the rotation speed of the dust collection motor 711 based on a predetermined correspondence relationship between the rotation speeds of the drive motor 31 and the dust collection motor 711. Information that defines the correspondence (hereinafter referred to as correspondence information) is stored in advance in, for example, the ROM of the control circuit 80.

FIG. 3 schematically illustrates the correspondence information that can be adopted in the first example. In this example, it is defined that the rotation speed of the dust collection motor 711 increases proportionally (linearly) from the minimum rotation speed (Rmin) to the maximum rotation speed (Rmax) as the rotation speed of the drive motor 31 increases. ing. Further, it is stipulated that when the rotation speed of the drive motor 31 exceeds a predetermined threshold value Rth, the rotation speed of the dust collection motor 711 is uniformly set to the maximum rotation speed Rmax. The control circuit 80 monitors the speed signal from the control circuit 50 while the switch 263 is on, and refers to the correspondence information to determine the rotation speed of the dust collection motor 711 according to the rotation speed of the drive motor 31. Set and drive the dust collection motor 711 at the set rotation speed. The control circuit 80 stops driving the dust collecting motor 711 when the switch 263 is turned off.

As described above, in the dust collecting system 1 of the first example, the control circuit 80 of the dust collecting device 7 has the rotating speed of the dust collecting motor 711 according to the rotating speed of the drive motor 31 which can change the dust generation state. Can be changed to change the dust collecting power of the dust collector. In particular, the control circuit 80 increases the rotational speed of the dust collecting motor 711 as the rotational speed of the drive motor 31 increases. Therefore, when the rotation speed of the drive motor 31 is relatively low and it is assumed that the amount of dust generated is relatively small, the power consumption of the dust collection motor 711 is suppressed, and the dust increases as the rotation speed of the drive motor 31 increases. Then, when it is assumed, the dust collecting power of the dust collecting device 7 can be increased.

The correspondence between the rotation speeds of the drive motor 31 and the dust collection motor 711 is not limited to the example shown in FIG. For example, the rotation speed of the dust collecting motor 711 is uniformly set to a relatively low rotation speed when the rotation speed of the drive motor 31 is equal to or less than the threshold value Rth, and when the rotation speed of the drive motor 31 exceeds the threshold value Rth. It may be specified to be uniformly set to a higher rotation speed. Further, for example, the rotation speed of the dust collection motor 711 is defined to increase quadratically (non-linearly) from the minimum rotation speed Rmin to the maximum rotation speed Rmax according to the increase in the rotation speed of the drive motor 31. It may be, or it may be specified to rise gradually.

As a second example, an example in which the drive time of the drive motor 31 is adopted as the drive state of the hammer drill 2 will be described. In this example, the control circuit 80 (more specifically, the CPU) is configured to change the rotation speed of the dust collection motor 711 according to the drive time of the drive motor 31. The drive time of the drive motor 31 refers to the duration of the drive state after the drive of the drive motor 31 is started. In this case, the control circuit 80 (CPU) recognizes that the drive of the drive motor 31 has started when the switch 263 is turned on, and measures the drive time using a timer. Then, the rotation speed of the dust collection motor 711 is set based on a predetermined correspondence relationship between the drive time and the rotation speed of the dust collection motor 711. Similar to the above example, the information defining the correspondence is stored in advance in, for example, the ROM of the control circuit 80.

FIG. 4 schematically illustrates the correspondence information that can be adopted in the second example. In the example of FIG. 4, the rotation speed of the dust collecting motor 711 is set to the rotation speed R1 while the drive time is equal to or less than the predetermined threshold T1, and is changed to the rotation speed R2 when the drive time exceeds the threshold T1. It is stipulated. The rotation speed R2 is higher than the rotation speed R1. The control circuit 80 monitors the drive time measured by the timer while the switch 263 is on, and sets and sets the rotation speed of the dust collection motor 711 according to the drive time with reference to the correspondence information. The dust collection motor 711 is driven at the speed of rotation. The control circuit 80 stops driving the dust collecting motor 711 when the switch 263 is turned off.

As described above, in the second example, the control circuit 80 of the dust collector 7 changes the rotation speed of the dust collector motor 711 according to the drive time of the drive motor 31 that can change the dust generation state, and collects the dust. The dust collecting power of the dust device can be changed. In particular, the control circuit 80 increases the rotation speed of the dust collecting motor 711 when the driving time exceeds the threshold value T1. Therefore, when the drive time of the drive motor 31 is relatively short and it is assumed that the amount of dust generated is relatively small, the power consumption of the dust collection motor 711 is suppressed, and the dust increases as the drive time becomes longer to some extent. The dust collecting power can be increased when it is assumed.

The correspondence between the drive time and the rotation speed of the dust collection motor 711 is not limited to the example shown in FIG. For example, the rotational speed of the dust collection motor 711 may be defined to be linear, non-linear, or stepwise increased as the drive time increases until the maximum rotational speed Rmax is reached.

Alternatively, as shown in the modified example shown in FIG. 5, the rotation speed of the dust collecting motor 711 is set to the maximum rotation speed Rmax while the drive time is equal to or less than the predetermined threshold T2, and rotates when the drive time exceeds the threshold T2. It may be specified that the speed is reduced to R3. That is, the control circuit 80 may be configured to drive the dust collecting motor 711 at a high speed only for a predetermined time from the start of driving the drive motor 31. If the drive of the drive motor 31 and the dust collection motor 711 are started at substantially the same timing, the start of suction of dust may be slightly delayed from the start of the processing work. According to this modification, even in such a case, it is possible to effectively collect the dust generated at the start of the processing work. The threshold value T2 of this modification is preferably set to a relatively small value (for example, about 5 seconds) in order to effectively collect dust and suppress wasteful power consumption of the dust collection motor 711. ..

Further, in combination with the example shown in FIG. 4, when the drive time exceeds the threshold value T2, the rotation speed of the dust collecting motor 711 is lowered from the maximum rotation speed Rmax to the rotation speed R3, and when the drive time exceeds the threshold value T1, the rotation speed is further reduced. It is also possible to raise it to R2.

Further, for example, the control circuit 80 (more specifically, the CPU) stops the dust collection motor 711 at a timing set according to the drive time of the drive motor 31 (that is, the rotation speed of the dust collection motor 711 is reduced. It may be configured to change to zero). The timing is set by providing a standby time according to the drive time of the drive motor 31 between the drive stop of the drive motor 31 and the drive stop of the dust collection motor 711. Specifically, the control circuit 80 (CPU) measures the drive time in the same manner as in the above example. Then, when it is recognized that the drive of the drive motor 31 has been stopped when the switch 263 is turned off, the standby time is set based on a predetermined correspondence relationship between the drive time and the standby time. Similar to the above example, the information defining the correspondence is stored in advance in, for example, the ROM of the control circuit 50. Further, the control circuit 50 uses a timer to measure the elapsed time from the drive stop of the drive motor 31, and when the elapsed time reaches the set standby time, the drive of the dust collection motor 711 is stopped.

FIG. 6 schematically illustrates the correspondence information that can be adopted in this modification. In the example of FIG. 6, when the drive time is equal to or less than the predetermined threshold value T3, the standby time increases proportionally (linearly) from zero to the upper limit time Tmax as the drive time increases, and the drive time sets the threshold value T3. If it exceeds, it is stipulated that the upper limit time Tmax is uniformly set. The control circuit 50 sets a standby time according to the drive time of the drive motor 31 with reference to the correspondence information, and stops driving the dust collector motor 711 when the set standby time elapses (rotation speed is reduced to zero). change.

Even if the drive of the drive motor 31 is stopped and the machining work is completed, the dust generated during the machining work may not be completely collected. On the other hand, in this modification, the control circuit 80 of the dust collector 7 provides a standby time according to the drive time of the drive motor 31 that can change the dust generation state. This makes it possible to effectively collect the dust remaining at the end of the processing work. In particular, the control circuit 80 sets a longer standby time as the drive time becomes longer. Therefore, when the drive time is relatively short and the possibility that dust remains is low, the power consumption of the dust collector motor 711 is suppressed, the drive time is relatively long, and there is a possibility that more dust remains. If there is, the dust collecting power of the dust collecting device 7 can be increased.

The correspondence between the drive time and the standby time is not limited to the example shown in FIG. For example, the standby time is specified to be uniformly set to a relatively short time when the drive time is equal to or less than the threshold value T3, and to be uniformly set to a longer time when the drive time exceeds the threshold value T3. You may. Further, the standby time may be specified to increase non-linearly or stepwise as the driving time increases until the upper limit time Tmax is reached.

As a third example, an example in which the vibration (acceleration) of the hammer drill 2 is adopted as the driving state of the hammer drill 2 will be described. As described above, the acceleration detected by the acceleration sensor 611 is a physical quantity indicating the vibration of the hammer drill 2 and also a physical quantity indicating the load applied to the tip tool 91. Therefore, it can be said that the third example is an example in which the load on the tip tool 91 is adopted as the driving state of the hammer drill 2. In this example, the control circuit 80 (more specifically, the CPU) is configured to change the rotational speed of the dust collection motor 711 in response to vibration (load). In this case, the control circuit 50 of the hammer drill 2 is configured to output the acceleration signal from the acceleration sensor 611 to the control circuit 80. Then, the control circuit 80 (CPU) sets the rotation speed of the dust collection motor 711 based on a predetermined correspondence relationship between the acceleration and the rotation speed of the dust collection motor 711. Similar to the above example, the information defining the correspondence is stored in advance in, for example, the ROM of the control circuit 80.

FIG. 7 schematically illustrates the correspondence information that can be adopted in this modification. In the example of FIG. 7, the rotation speed of the dust collecting motor 711 is set to the rotation speed R4 while the acceleration indicated by the acceleration signal is equal to or less than the predetermined threshold value A1, and is changed to the rotation speed R5 when the acceleration exceeds the threshold value A1. Is stipulated. The rotation speed R5 is higher than the rotation speed R4. The control circuit 80 monitors the acceleration signal from the control circuit 50 while the switch 263 is on, and sets the rotation speed of the dust collection motor 711 according to the detected acceleration by referring to the correspondence information. , Drives the dust collection motor 711 at the set rotation speed. The control circuit 80 stops driving the dust collecting motor 711 when the switch 263 is turned off.

As described above, in the third example, the control circuit 80 of the dust collector 7 changes the rotation speed of the dust collector motor 711 according to the change of the vibration (load) that can change the dust generation state, and collects the dust. The dust collecting power of the dust device can be changed. In particular, the control circuit 80 increases the rotation speed of the dust collecting motor 711 as the vibration (load) increases. Therefore, when the vibration (load) is relatively small, the power consumption of the dust collecting motor 711 motor can be suppressed, and when the vibration (load) is relatively large, the dust collecting force of the dust collecting device 7 can be increased.

The correspondence between the acceleration and the rotation speed of the dust collecting motor 711 is not limited to the example shown in FIG. For example, the rotational speed of the dust collecting motor 711 may be specified to increase linearly, non-linearly, or stepwise as the acceleration increases.

Further, as described above, the control circuit 50 of the hammer drill 2 determines whether it is in a no-load state or a load state based on the detected acceleration, and performs soft no-load control. Therefore, the control circuit 80 may be further configured to change the rotation speed of the dust collecting motor 711 in conjunction with the soft no-load control by the control circuit 50.

In this modification, for example, the threshold value of the acceleration for discriminating between the no-load state and the load state used in the soft no-load control may be adopted as the threshold value A1 in the example of FIG. 7. Further, similarly to the rotation speed of the drive motor 31, the rotation speed of the dust collecting motor 711 does not exceed a predetermined initial rotation speed according to the operation amount of the trigger 261 when the acceleration is equal to or less than the threshold value A1. When it is set and the acceleration exceeds the threshold value A1, it may be set faster than the initial rotation speed according to the operation amount of the trigger 261. In this case, the rotation speed of the dust collection motor 711 is equivalent to being changed according to the rotation speed of the drive motor 31. The initial rotation speed of the dust collection motor 711 may be set separately from the initial rotation speed of the drive motor 31.

As described above, according to the present modification, the acceleration (vibration) detected by the acceleration sensor 611 is effectively used for both the soft no-load control of the drive motor 31 and the control of the dust collection motor 711. Further, the control circuit 80 changes the rotation speed of the dust collector motor 711 in conjunction with the rotation speed of the drive motor 31, so that the dust collector 7 can be in a no-load state or a load state. It is possible to appropriately change the dust collecting power.

The control of the dust collecting motor 711 according to the first to third examples and the modified examples described above may be adopted alone or in combination as appropriate.

The correspondence between each component of the above embodiment and each component of the present invention is shown below. The dust collection system is an example of a "dust collection system". The hammer drill 2 is an example of a “power tool”. The tip tool 91 is an example of a “tip tool”. The dust collector 7 is an example of a “dust collector”. The drive motor 31 and the drive mechanism 35 are examples of the “first motor” and the “drive mechanism”, respectively. The dust collecting motor 711, the fan 713, and the control circuit 80 are examples of the “second motor”, the “fan”, and the “first control device”, respectively. The acceleration sensor 611 is an example of a "vibration detection device" and a "load detection device". The control circuit 50 of the hammer drill 2 is an example of the “second control device” and the “third control device”.

It should be noted that the above embodiment is merely an example, and the striking tool according to the present invention is not limited to the configuration of the illustrated dust collecting system 1 (hammer drill 2 and dust collecting device 7). For example, the changes illustrated below can be made. In addition, only one or a plurality of these changes may be adopted in combination with the dust collecting system 1 shown in the embodiment or the invention described in each claim.

In the above embodiment, the hammer drill 2 is mentioned as an example of a power tool configured to perform a machining operation by driving a tip tool. However, the power tools that can be used in the dust collection system 1 are not limited to the hammer drill 2, and any power tool used for processing work that can generate dust (for example, drilling work, chipping work) is used. Good. For example, instead of the hammer drill 2, an electric hammer, a vibration drill, or an electric drill may be adopted. Further, a hammer drill having only a hammer drill mode and a hammer mode may be adopted.

In the above embodiment, the acceleration sensor 611 is adopted as the detection device for detecting the vibration of the hammer drill 2, but instead of this, another sensor capable of detecting the vibration (for example, a speed sensor, a displacement sensor, etc.) is used. It may be adopted.

Further, in the above embodiment, the acceleration sensor 611 is also used as a detection device for detecting the load applied to the tip tool 91. However, the detection device for detecting the load is not limited to the acceleration sensor 611.

For example, in the hammer drill 2, the handle 25 moves forward with respect to the main body housing 21 as the tip tool 91 is pressed against the work piece. Therefore, the load may be detected by the position sensor that detects the relative movement of the handle 25 with respect to the main body housing 21. As such a position sensor, for example, a non-contact type (for example, magnetic field detection type, optical type) sensor may be adopted, or a contact type detection mechanism (for example, a mechanical switch) may be adopted. Good. Further, for example, the striking tool includes a moving unit configured to move backward relative to the main body housing 21 integrally with the tip tool 91 in conjunction with pressing of the tip tool 91 against the work material. There is something. In this case as well, the position sensor can be adopted in the same manner. Further, the grip portion gripped by the user may be provided with a detection device (for example, a force sensor) for detecting a forward pressing force. The drilling tool may be provided with a detection device (for example, a force sensor) that detects a pressing force behind the spindle that rotationally drives the tip tool. Further, the load may be detected by the load current of the drive motor 31 or the temperature change of the battery 93.

Further, a plurality of types of information (index value, physical quantity) corresponding to the load applied to the tip tool 91 may be detected and used for controlling the rotation speed of the dust collecting motor 711. For example, even if a separate detection device (for example, an acceleration sensor and a position sensor) is provided to detect vibration and other loads, respectively, and the rotation speed of the dust collection motor 711 is controlled based on the detection results of both. Good.

In the above embodiment, the acceleration, which is a physical quantity corresponding to the vibration and the load on the tip tool 91, is also used for the soft no-load processing of the drive motor 31. However, the control circuit 80 may change the rotation speed of the dust collecting motor 711 according to vibration or other load regardless of whether or not the soft no-load processing is performed. Further, the control circuit 50 does not necessarily have to perform soft no-load control. For example, the drive motor 31 may be driven at a rotation speed simply according to the operation amount of the trigger 261, or may be driven at a constant rotation speed. You may.

Further, in the above embodiment, when the switch 263 is turned on, the control circuit 50 of the hammer drill 2 and the control circuit 80 of the dust collector 7 start driving the drive motor 31 and the dust collector motor 711, respectively. That is, the control circuits 50 and 80 start driving the drive motor 31 and the dust collection motor 711 at substantially the same timing. However, the control circuits 50 and 80 may start driving the drive motor 31 and the dust collection motor 711 at different timings. Further, the drive of the drive motor 31 and the dust collection motor 711 may be stopped at different timings.

For example, as shown in FIG. 8, the control circuit 80 of the dust collector 7 starts driving the dust collecting motor 711 before starting driving of the drive motor 31 by the control circuit 50 of the hammer drill 2, and stops driving the drive motor 31. The drive of the dust collecting motor 711 may be stopped later. Specifically, when the switch 263 is turned on at time T4, the control circuit 50 starts driving the drive motor 31 after a lapse of a predetermined time, and when the switch 263 is turned off at time T5, Immediately stop driving the drive motor 31. On the other hand, the control circuit 80 immediately starts driving the dust collecting motor 711 at time T4, and stops driving the dust collecting motor 711 after a lapse of a predetermined time from time T5. In this case, it is possible to effectively collect the dust generated at the start of the processing work. In addition, it becomes possible to more reliably collect the dust remaining after the processing work is completed.

In the above embodiment, the control circuit 50 of the hammer drill 2 and the control circuit 80 of the dust collector 7 control the drive of the drive motor 31 and the dust collector motor 711 independently of each other. However, for example, the control circuit 50 of the hammer drill 2 may perform both the drive control processing of the drive motor 31 and the dust collection motor 711 described above. Further, each of the drive control processes of the drive motor 31 and the dust collection motor 711 described above may be distributed in a plurality of control circuits. In the above embodiment, an example in which the control circuits 50 and 80 are configured by a microcomputer including a CPU and the like is given. However, the control circuits 50 and 80 may be composed of programmable logic devices such as ASIC (Application Specific Integrated Circuits) and FPGA (Field Programmable Gate Array).

The configuration and connection structure of the main body housing 21 and the handle 25 of the hammer drill 2 and the configuration and arrangement of the internal structure of the hammer drill 2 (drive motor 31, drive mechanism 35, controller 5, etc.) can be changed as appropriate. For example, the drive motor 31 may be a motor having a brush or an AC motor. The drive mechanism 35 may employ a motion conversion mechanism using a crank mechanism instead of a motion conversion mechanism using a swing member.

The battery mounting portion 245 may be provided in the main body housing 21 instead of being provided in the handle 25. Further, only one battery mounting portion 245 may be provided, or three or more battery mounting portions 245 may be provided. That is, the number of batteries 93 that can be attached to the hammer drill 2 may be other than 2. Further, the hammer drill 2 may be connectable to an external AC power source.

The configuration of the dust collector 7 can also be changed as appropriate. For example, the shape and arrangement of the main body housing 70, the sliding portion 75 and the dust transfer path 77, the attachment / detachment structure to the hammer drill 2, and the configurations of the dust collection motor 711 and the fan 713 can be appropriately changed. For example, the dust collecting motor 711 may be a brushless motor. Further, as described above, when the control circuit 50 of the hammer drill 2 controls the drive of the drive motor 31 and the dust collection motor 711, the controller 8 does not include the control circuit 80 but includes only the drive circuit 81. You may.

Further, in view of the gist of the present invention and the above-described embodiment, the following aspects are constructed. The following embodiments may be employed in combination with the above embodiments and variations thereof, and one or more of the inventions described in each claim.
[Aspect 1]
The first control device is configured so that the higher the rotational speed of the first motor, the higher the rotational speed of the second motor.
[Aspect 2]
The power tool further includes a speed detection device configured to detect the rotational speed of the first motor.
The control circuit 50 (specifically, the CPU) or the Hall sensor 53 of the above embodiment is an example of the "speed detection device" in this embodiment.
[Aspect 3]
The first control device is configured to increase the rotational speed of the second motor as the driving time becomes longer.
[Aspect 4]
The dust collecting system further includes a time measuring device for measuring the driving time.
The timer of the control circuit 80 of the above embodiment is an example of the "time measuring device" in this embodiment.
[Aspect 5]
The first control device is configured to set the standby time longer as the drive time becomes longer.
[Aspect 6]
The first control device is configured to increase the rotational speed of the second motor as the vibration increases.
[Aspect 7]
The power tool includes a main body housing that houses the first motor and the drive mechanism, and the vibration detection device is provided in the main body housing.
The main body housing 21 of the above embodiment is an example of the "main body housing" in this embodiment.
[Aspect 8]
The first control device is configured to increase the rotational speed of the second motor as the load increases.
[Aspect 9]
The first control device is provided in the dust collector.
The second control device is provided on the power tool.
[Aspect 10]
The dust collector is configured to be removable from the power tool.
Each of the power tool and the dust collector comprises a connector configured to electrically connect to each other as the dust collector is mounted on the power tool.

Further, embodiments 11-12 are constructed for the purpose of effectively collecting dust generated at the start of processing work. Aspects 11-12 may be adopted alone or in combination with one or more of the above embodiments and variations thereof, aspects 1-10, and the inventions described in each claim.
[Aspect 11]
A dust collection system including a power tool configured to perform machining work on a work material by driving a tip tool and a dust collector configured to collect dust generated in the machining work. And
The power tool
With the first motor
A drive mechanism configured to drive the tip tool by the power of the first motor, and
Equipped with an operating member that can be operated externally by the user
The dust collector
With the second motor
It includes a fan that is rotationally driven by the second motor and is configured to generate an air stream for dust collection.
The dust collecting system
The first control device that controls the drive of the first motor and
A second control device for controlling the drive of the second motor is provided.
The second control device starts driving the second motor in response to the operation of the operating member, and the first control device starts driving the first motor after starting driving of the second motor. A dust collection system characterized by being configured in.
According to this aspect, after the second motor for dust collection is driven, the driving of the tip tool is started and the machining work is performed. Therefore, the dust collector can effectively collect the dust generated at the start of the processing work. The first control device and the second control device may be provided in the power tool or the dust collector, respectively. Further, the second control device may be provided separately from the first control device, or may be shared by the first control device. The control circuit 50 (specifically, CPU) and control circuit of the above embodiment. 80 (specifically, CPU) is an example of the "first control device" and the "second control device" in this embodiment, respectively.

[Aspect 12]
The dust collecting system according to aspect 11.
The first control device stops the drive of the first motor in response to the release of the operation of the operation member, and the second control device stops the drive of the second motor after the drive of the first motor is stopped. A dust collection system characterized by being configured to do so.

1: Dust collection system, 2: Hammer drill, 21: Main body housing, 22: Drive mechanism housing, 23: Motor housing, 231: Speed change dial unit, 24: Controller housing, 245: Battery mounting unit, 25: Handle, 26: Grip part, 261: Trigger, 263: Switch, 28: Upper connection part, 281: Elastic member, 29: Lower connection part, 291: Support shaft, 31: Drive motor, 311: Motor shaft, 35: Drive mechanism , 39: Tool holder, 5: Controller, 50: Control circuit, 51: Drive circuit, 53: Hall sensor, 55: Current detection amplifier, 59: Connector, 61: Acceleration sensor unit, 610: Control circuit, 611: Acceleration sensor , 7: Dust collector, 70: Main body housing, 701: Sliding guide, 703: Connector, 705: Motor housing, 711: Dust collector, 713: Fan, 715: Connector, 73: Dust case, 735 : Filter, 75: Sliding part, 751: 1st tubular part, 752: 2nd tubular part, 753: Cover part, 754: Suction port, 77: Dust transfer path, 771: Hose, 772: Spring, 775 : Hose connection, 8: Controller, 80: Control circuit, 81: Drive circuit, 91: Tip tool, 93: Battery, A1: Drive shaft

Claims (8)

A dust collection system including a power tool configured to perform machining work on a work material by driving a tip tool and a dust collector configured to collect dust generated in the machining work. And
The power tool
With the first motor
It is provided with a drive mechanism configured to drive the tip tool by the power of the first motor.
The dust collector
With the second motor
It includes a fan that is rotationally driven by the second motor and is configured to generate an air stream for dust collection.
The dust collecting system includes a first control device configured to control the rotation speed of the second motor according to a driving state of the power tool. The dust collecting system according to claim 1.
The dust collecting system is characterized in that the first control device is configured to change the rotational speed of the second motor according to the rotational speed of the first motor. The dust collecting system according to claim 1 or 2.
The dust collecting system is characterized in that the first control device is configured to change the rotational speed of the second motor according to the driving time from the start of driving the first motor. The dust collecting system according to claim 3.
The first control device drives the second motor at the first rotation speed until the drive time reaches a predetermined time, and when the drive time reaches the predetermined time, the rotation speed of the second motor is reduced. , A dust collecting system characterized in that it is configured to change to a second rotation speed lower than the first rotation speed. The dust collecting system according to any one of claims 1 to 4.
After the drive of the first motor is stopped, the first control device reduces the rotation speed of the second motor to zero when a standby time corresponding to the drive time from the start of drive of the first motor elapses. A dust collection system characterized by being configured to change. The dust collecting system according to any one of claims 1 to 5.
The power tool further includes a load detecting device for detecting a load applied to the tip tool.
The dust collecting system is characterized in that the first control device is configured to change the rotation speed of the second motor according to the load. The dust collecting system according to claim 6.
The load detecting device is configured to detect at least the vibration of the power tool as the load.
The dust collecting system is characterized in that the first control device is configured to change the rotational speed of the second motor in response to the vibration. The dust collecting system according to claim 6 or 7.
When the load is equal to or less than a predetermined threshold, the first motor is driven at a rotation speed not exceeding a predetermined upper limit rotation speed, and when the load exceeds the threshold, the first motor is driven at a rotation speed exceeding the upper limit rotation speed. Further equipped with a second control device configured to drive the motor,
The dust collecting system is characterized in that the first control device is configured to change the rotation speed of the second motor in conjunction with the control of the first motor by the second control device.

Images